Stop-off valve for gas



(N03 Model.)

3 J. L. CHAPMAN.

STOP-0P3 VALVE 'FOR GAS.

No; 334,339. Patented J33. 19,1336.

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, WITNESSES: i 7 1 V NTOR N gg 4 TTORNEY JOSEPH L. CHAPMAN, OF HADDONFIELD, NEWV JERSEY.

STOP-OFF VALVE FOR GAS.

SPECIFICATION forming part of Letters Patent No. 334,639, dated January 19, 1886.

Application filed April 23, 1885.

To all whom it Wtay concern.-

Be it known that I, Josnrn L. CHAPMAN, of Haddonfield, in the county of Camden and State of New Jersey, have invented a new and valuable Improvement in Stop-Off Valves for Gas; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawing, making a part of this specification, and to the letters and figures of reference marked thereon.

The figure is a longitudinal vertical section, partly in elevation, of an automatic gas-stopoff device embodying my improvements.

My invention has relation to stop off devices for automatically stopping the flow or admission of natural or other gases to burners, furnaces, or other fixtures wherein it is consumed or used; and it has for its object to provide an effective and durable automatic stop-off to out off communication between the supply and delivery pipes when for some reason the flow of the gas to the main or supply pipes is stopped. It is important that this should be effectively done, as it frequently'happens that when the supply of gas in the mains ceases to flow the fires go out, and upon a renewal of the flow the rooms are filled, and an explosion results, if a match is ignited, sometimes causing great damage.

My invention accordingly consists of the combination, construction, and arrangement of parts, as hereinafter more particularly described and claimed.

In the drawing, A represents a cylindrical or other appropriately-shaped body, having gas-inlet pipe at, terminating in a chamber, A, outlet-pipe a, bottom screw or removable plug, a, and an open top, a having outside flange or rim, a. Upon said flange a rests a flexible diaphragm, B, which is held in place or is clamped at its periphery by a flange, 0, on the dish-shaped cap or cover 0, firmly bolted to body A by, preferably, screw-bolts c, passing through flanges a and c, as shown. The cap 0 has a vent or air pipe, 0 an outside top nipple, 0 upon which screws a cap, D, which incloses the handle or knob e of a rod, E, passing through a central opening, 0', in nipple 0 The lower end of rod E screws Serial No. 163,109. (No model.)

or is otherwise fastened, as desired, to the end f of a yoke, F, which end f projects upwardly through a central aperture in diaphragm B, and is connected therewith by a v screw-nut, f, as shown, a washer, f being preferably located between nut f and diaphragm B, to more firmly clamp the yoke to the diaphragm, so that it will sustain the yoke in a'suspended or pendent position in body A. To the lower end, of said yoke is secured a valve, G. This valve G is exteriorly partly fluted or corrugated longitudinally, as shown, and passes through an opening,'g, in the bottom of chamber A, and seats itself upon the upper edge flange, 9 at the top of said opening 9, the valve or its seat being provided with a rubber gasket or packing material, g, to effect a gas-tight joint when the valve is upon its seat or closed.

In line with the opening 9 in the top of chamber A is an opening, h, into which screws a plug, H, having a central tubular opening, h, into which passes a guide rod or stem, 9 projecting from valve G, as shown, for steadying the movement of said valve.

The operation is obvious. When the supply of gas is stopped,valve G stops automatically any future flow of gas until the cap D is unscrewed and rod 0 is raised. To open said valve, the cap D is unscrewed and the rod E is manually raised to elevate the diaphragm B, yoke F, and lift the valve G off its seat, to open communication from inlet-pipe a to outlet-pipe a. As long as the gas continues to flow, its pressure, whether it varies or not in chamber A, will keep the valve G open; but as soon as the gas ceases to flow, the gravity of valve G causes it to drop upon its seat, to automatically close the passage-way through the st0p-0ff for the gas, so that when it reflows it cannot pass through the stop-ofi until its valve G is manually raised.

It will be observed that all the parts composing the stop-off are removable from one another, and are therefore easily detached for repairs, adjustment, and replacement of said parts, or for other purposes.

What I claim is- 1. In a gas stopofi', a body, A, having an inlet-opening terminating in chamber A, having valve seat 9 within said chamber, and

screw-plug H, provided with a bore or opening, h, the valve G, having guide-stem g sliding in bore h, diaphragm B, yoke F, connecting said valve and diaphragm, a rod, E, for manuallylifting said valve and diaphragm, and a cap or cover for body A, substantially as shown and described.

2. The stop-01f herein shown and described, comprising a body, A, having an inlet-opening terminating in a chamber, A, having an outlet-opening to body A, and to which is adapted a valve, G, a diaphragm, B, having a lifting-rod, E, and a yoke, F, connecting valve G and diaphragm B, whereby valve G is manually raised to open a passage-way through I 5 the stop-off for the flow of gas, is maintained in its raised position as long as the gas flows by the pressure of the latter against the diaphragm, and falls by gravity to close the passage-way through the stop-off when the gas 20 ceases to flow.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

JOSEPH L. CHAPMAN. Witnesses:

GEORGE XV. SELTZER, ALLEN H. GANGEWER. 

